Device for the remote transmission of control impulses



Patented July 1930;

' UNITED STATES PAT NT. OFFICE mm now, or srAnnAuQonnmm-nssronoa 'rosrmmns-scnucxnnrwnnim ensnnrscnur MIT nnsonnmxrnn Immune, orIBEBLIN-SIEMENSSTADT, enn- HANY, A CORPORATION OF nnvrcnnon ran nnuo'rn'rnansmssron or conrnor. menses Application filed November 8, 1929,Serial 11:0. 148,28, and in Germany Kovember 19, 1885.

My invention relates to a device for-the remote transmission of controlmpulses. F or compensating varlatlons 1n the condlcalled impulseregulation. The deviations in the condition of the medium to be regulated from its normal value influence adjusting devices which by thecontrol of regulat- 19 ing devices restore the original state of the amedium to be regulated;

The hitherto known impulse regulations maybe divided in two groups. Thefirst group is that in which the part subjected to the impulse directlytransmits its'motion to an adjusting device positively coupled with it.The second group is'characterized by the indirect transmission of theimpulse movement u on the adjusting. and regulatin ,devices. inprinciple the, regulations 0 the last named grou are distinguished bythe feature that arti cial fluctuatlons are caused in a control liquidby the impulse motionwhich in their turn act upon control devices for asecond control liquid which in its turn only operates the regulatingdevices.

My invention provides a third group of such control devices. It alsorelates to a device for the remote transmission or teletransmission ofcontrol impulses which are released by changes in the condition of gasesor liquids, but difi'ers from the present day known arrangements by thepart responding to the impulse transmitting its motion directly upon theadjusting device, the adjusting device being positively connected withthe partresponding to the impulse. v

In the remote transmission of control impulses as required in the firstplace in modern steam power plants, com aratively long distances aresometimes to be bridged over by the transmission device. For thispurpose the first mentioned group of transmission devices is entirelyuseless. Owing to the positive coupling of the impulse carrier with theadjustin device a close constructive combination 0 the two parts isrendered necessary. This drawback is eliminated by the second kind ofthe impulse regulations which, however, has the disadvantage-that theindirect the regulating mechanism. In order to obrial.

control by the aid of various auxiliary con- 4 trol devices complicatesthe la out of the plant and thus augments the li tion of any gaseous orliquid medium a spe- I cial kind of regulation is employed,- the so-.

change of pressure in a gaseous or liquid medium.

Referring to the drawing, 1 is the impulse conveying pipe through whichthe variations m pressure are transmitted to the part adapted to receivethe impulse. The pipe 1 opens mto a cylinder 2 in which a plunger 3operates. The motion of-the piston is transmltted to a pressure liquid 4which deflects a diaphragm 5 and thus displaces the liquid in thechamber 6. The displaced quantity of hquld is conveyed below a controlpiston 7 which is coupled with a further piston 8. This piston 8 servesfor the control of a ressure l1quid by the motion of which" a va ve 9 iscontrolled. The device operates in the following manner: When thepressure in the plpe 1 rises .the plunger 3 moves upwards. On the upperend of the plunger 3 is mounted a piston 10 of larger diameter than theplunger3. By this arrangement the pressure.

'in the chamber 4 is reduced in relationlto the 13 containing thepressure liquid which forms the positive coupling between the impulseresponsive part and the adjusting device of tain with small forces alsoa large deflection,

the diaphragm must be made of a soft mate- This would, however, impairits strength which is not desirable in view of the high stresses towhich it is subjected. To

. for example a column of mercury.

avoid the risk of rupture the impulse pressure is balanced up to adefinite smallest value by providing Within the chamber 1 1 a counterforce which corresponds with this minimum value. This counterforce isproduced by the static pressure of a column of liguid 15,

y compressing the cylindrical diaphragm 13 the liquid is forced from thechamber 6 into the chamber 16 which is enclosed by a cylindricaldiaphragm 17. In order to obtain even with small displaced quantities,that means with small impulse quantities, long strokes of the controlpiston 8, the cylindrical diaphragm 17 is made smaller than thecylindrical diaphragm 13 so that an increase in the lift takes placebetween the diaphragm 13 and the diaphragm 17. By forcing the pressureliquid into the chamber 16 the piston 7 is moved upwards and therebysimultaneously the piston 8. The piston 8 uncovers during its upstrokethe control edge 20 so that the pressure oil below the piston 24 canenter the chamber 19 through the pipe 23 and escape through the pipe 18.The valve 9 thus descends so that the passage of the working medium isthrottled and its pressure reduced thereby. The piston slide bushing22is connected with the valve rod 25 by a lever26 which is pivoted at27. During the descent of the valve 9 the piston slide bushing or liner22 is moved up- Wards and the distribution edge 20 covered by the piston8. If the desired. condition of the opei ating medium is not attainedVet the impulse motion commences again until. the normal state isproduced again.

-When the pressure in the pipe 1 drops the control process takes placein the reverse order. A second impulse pipe 29 is connected with thepressure pipe 28. By this manner of connection it is rendered possibleto control the valve 9 from two different supervision stations of theworking medium, so that a preliminary regulation may be effected by apreliminary impulse prior to the main impulse becoming operative.

Into the pipe 28 is further inserted a device 30 which serves forcompensating changes in volume in this pipe. In this way temperaturefluctuations remain without effect upon the accuracy of the regulatingprocess. This device may consist for instance of a housing of similarcharacter to 13 or 17 and may be compressed to a greater or smallerextent by an adjusting screw.

Various modifications and changes may be made without departing from thespirit and scope of the invention, and I desire, therefore, that onlysuch limitations shall be placed thereon asare imposed by the prior art.

I claim as my invention 1. A device for the transmission of controlimpulses caused by changes in the state of a fluid, comprising anelement having a small pressure receiving area and a large pressuretransmitting area for transforming the original pressure at which theimpulses are exerted into lower pressure impulses, static pressure meansfor balancing the reduced pressure, and means for transmitting the lowpressure impulses to the point of control, and means for transformingsaid impulses into controlling motions at said control point.

2. A device for the transmission of control impulsescaused by changes inthe state of a fluid, comprising means for transforming the originalpressure at which the impulses are exerted, into lower pressureimpulses, a fluid transmitter for conveying the low pressure impulses tothe point of control and an auxiliary actuating, device operated by thelow pressure fluid impulses for initiating the controlling motions atthe control point.

3. A device for the transmission of control impulses caused by changesin the state of a fluid, comprising a housing containing a double pistonhaving a small area exposed to the original pressure at which theimpulses are exerted, and a large area, and a non-compressible fluid incontact with the large piston for receiving the original impulses atlower pressure and for transmitting them to the remote point of control,and means operated by said transmitting fluid for initiating the controlmotions at the control point.

4. A device for the transmission of control impulses caused by changesin the state of a fluid, comprising a housing containing two chambersand a double piston having a small area exposed in one chamber andexposed to the original pressure at which the impulses are exerted, saidpiston having a large area exposed in the other chamber, fortransforming said original pressure impulses to lower pressure impulses,a diaphragm closing said latter chamber, and noncompressible liquid insaid chamber, displaceable by said large piston to operate saiddiaphragm, and a non-compressible liquid connection from the other sideof said diaphragm to the point of control for transmitting the lowpressure impulses imparted by the large piston to the point of control.and means at said point, operated by said transmitted impulses, forinitiating the de-' sired control motion.

5. A device for the transmission of control impulses causedrby changesin the state of a fluid comprising a housing containing a double pistonof small and large area. to reduce at the ratio of the piston areas thepressure at which the original impulses are imparted, a pressure fluidactuated by the large piston, an operating element at the controlledpoint actuated by the pressure fluid displacement of the large piston toperform a stroke larger than the large piston stroke, and an operatingmedium controlled by said operating element for roducing' the controlmotions at the contro led point. I

6. A device for the transmission of control impulses by fluiddisplacement, coin' prising a housing containin a plunger pis-' ton anda chamber connecte with the pressure fluid, a similar cylindricaldiaphragm at the point of control and a ipe line connecting it with saidfirst cy indrical diaphragm. and an operating element connected withsecond cylindrical iaphragm forcontrolling an operating medium inaccordance with the received impulses.

7. A device for the transmission of control impulses, by fluiddisplacement comprising diaphragm closing said a housing containing aplunger piston and a chamber connected with the pressure impulse sourceand in which the plunger operates, a second chamber containing a pistonfixed to the plunger and being larger than the latter to reduce thepressure at the ratio of the piston areas to reduce the pressure of thereceived impulses, a non-compressible fluid exposed to said largerpiston, a main uid compartment, a third chamber in said housingcontaining a cylindrical diaphragm and pressure fluid inside and outsidethereof to communicate the reduced pressure impulses from the main diahragm to said inside pressure fluid, a similar cylindrical diaphragm atthe point of control and a ipe line connecting it with said firstcylindr cal diaphragm and an operating element connected with secondcylindrical diaphragm for controlling an operating medium in accordancewith the received impulses, and a static column of liquid acting uponthe outside fluid in said third housing chamber to substantially balancethe static pressure at both sides of said main diaphragm.

8. A device for the transmission of control impulses, by fluiddisplacement comprising a housing containing a plunger piston and achamber connected with the pressure impulse source and in which theplunger operates, a second chamber containing a piston fixed to thelunger and being larger than the latter to reduce the p'ressureat theratio of the piston areas to reduce the pressure of the receivedimpulses, a non-compressible'fluid exposed to said larger piston, a maindiaphragm closing saidlfluid compartment, a. I

third chamber in said housing containing a cylindrical dia hragm andpressure flu1d 1nslde and outsi e thereof to commumcate the reducedpressure impulses from the main diahragm to said inside pressure fluid,a simi- Farcylindrical diaphragm at thepoint of control and a i lineconnecting'it W113i! said first cylin rical diaphragm and an operatingelement connected with second cylindrical diaphragm for controlling anoperating medium in accordance with the received impulses, and means insaid pipe line for compensating the influence of temperaturefluctuations upon the liquid transmission system.

9. In a fluid pressure-regulator responding to the varying pressures ofthe controlled fluid, in combination with a main fluid control mechanismand an auxiliary control mechanism for governing the operation of themain mechanism, a pressure responsive element having a piston memberprovided with two heads of different eflfective areas for reducing thepressure effect of the controlled fluid, the smaller piston head beingexposed to the pressure of the fluid to be controlled, the larger pistonhead being exposed to a trans mitting liquid,'and means for actuatingsaid I auxiliarymechanism by the displacement of said transmittingliquid.

10. In a fluid pressure regulator responding to the varying pressures ofthe controlled fluid, in combination with a main fluid control mechanismand an auxiliary control mechanism for governing the operation of. themain mechanism, a pressure responsive element comprisinga housingcontaining a piston for reducing the pressure efl'ect of the controlledfluid, said piston having a small area head exposed to the pressure ofthe controlled fluid and a large area head, a chamber in said housingfor said large piston head, a compartment fil ed with a liquid andhaving at one end a movable tight wall in contact with and separatingthe large piston head from the li uid, and means responsive to theliquid disp acement produced by the large piston head for actuating saidauxiliary area head exposed to the pressure of the controlled fluid anda large area head, a chamber in said housing for said large piston head,a compartment filled with a liquid and havin a flexible tight diaphragmin contact with and separating the large piston head from the liquid,and means responsive to the liquid displacement produced by the largepiston head for actuating said auxlliary mechanism.

12. In a fluid pressure regulator responding to the varying pressures ofthe controlled fluid, in combination with a main fluid control mechanismand an auxiliary control mechanism for governing the operation of themain mechanism, a pressure responsive element having a piston memberprovided with two different efi'ective head areas for reducing thepressure effect of the controlled fluid, the smaller piston area beingexposed to the pressure of the fluid to be controlled, the larger areabeing exposed to a transmitting liquid, and means for actuating saidauxiliary mechanism by the displacement of said transmitting liquid, andmeans for balancing the desired minimum pressure exerted by the largepiston area.

In testimony whereof I afiix my signature.

MARTIN EULE.

